Emergency yawing circuit and method for out-of-control rotation speed of wind turbine generator

Abstract

The invention discloses an emergency yawing circuit and method for out-of-control rotation speed of a wind turbine generator. The circuit comprises a first speed relay, a first non-time-delay relay, acontactor and a first time-delay relay. A first normally open contact of the first non-time-delay relay, a normally closed contact of the first time-delay relay and a coil of the contactor are connected in series to form a series branch; the series branch is connected with a power supply; a normally open contact of the contactor is connected with a yawing device; a first contact of the first speed relay and a second normally open contact of the first non-delay relay are connected in parallel to form a first parallel branch; a second contact of the first speed relay is connected with a coil ofthe first non-delay relay in series and then connected with a coil of the first delay relay in parallel to form a second parallel branch; and the first parallel branch and the second parallel branchare connected in series and then connected with the series branch in parallel. By the adoption of the circuit and method, yaw processing can be conducted on out-of-control with the rotating speed larger than the rated rotating speed, and the wind turbine generator is prevented from yawing excessively.

Description

technical field [0001] The invention relates to the technical field of control of wind turbines, in particular to an emergency yaw circuit and method for wind turbines whose rotation speed is out of control. Background technique [0002] There are many reasons that affect the safe operation of the wind turbine. Factors such as pitch control system failure, backup power failure, slip ring failure, daily maintenance and improper management can cause the speed of the wind turbine to get out of control, and in extreme cases even cause the unit to fly ( That is, the braking system of the wind turbine fails, the impeller speed exceeds the allowable or rated speed, and the unit is out of control), if it is not effectively controlled, the wind turbine will suffer devastating blows such as blade breakage and tower collapse, which will cause huge economic losses. loss, or even endanger personal safety. [0003] The existing emergency yaw technology can only deal with the out-of-contr...

AI Technical Summary

Problems solved by technology

If the out-of-control of the speed less than the rated speed cannot be effectively controlled (that is, the speed is less than or equal to the rated speed and the brake is in the braking state, but the speed of the wind turbine is still greater than the safe speed at this time), the wind turbine will still have frequent accidents.

In addition, the existing emergency yaw circuit cannot stop the yaw in time after it is activated, resulting in excessive yaw of the wind turbine and causing damage to the wind turbine

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